Don't render bold ANSI sequence when colors are disabled

[adam12]

When providing the --no-colors or colors: false options to Lefthook, it will still render an ANSI
sequence for bold, causing noise in the terminal.

Before

Lefthook v1.4.1
RUNNING HOOK: ^[[1mpre-commit^[[0m
^[[1mstandardrb^[[0m: (skip) no matching staged files

SUMMARY: (SKIP EMPTY)

After

Lefthook v1.4.3
RUNNING HOOK: pre-commit
standardrb: (skip) no matching staged files

SUMMARY: (SKIP EMPTY)

⚡ Summary

Add a similar check for std.colors to the Bold function.

☑️ Checklist

• Check locally
• Add tests

[mrexox]

Thank you!